Nothing Special   »   [go: up one dir, main page]

CA2429837C - Method for removing mercury from gas - Google Patents

Method for removing mercury from gas Download PDF

Info

Publication number
CA2429837C
CA2429837C CA002429837A CA2429837A CA2429837C CA 2429837 C CA2429837 C CA 2429837C CA 002429837 A CA002429837 A CA 002429837A CA 2429837 A CA2429837 A CA 2429837A CA 2429837 C CA2429837 C CA 2429837C
Authority
CA
Canada
Prior art keywords
mercury
selenium
gas
sulphuric acid
chlorine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA002429837A
Other languages
French (fr)
Other versions
CA2429837A1 (en
Inventor
Helja Peltola
Pekka Taskinen
Heikki Takala
Jens Nyberg
Harri Natunen
Jorma Panula
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metso Corp
Original Assignee
Outokumpu Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of CA2429837A1 publication Critical patent/CA2429837A1/en
Application granted granted Critical
Publication of CA2429837C publication Critical patent/CA2429837C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B19/00Selenium; Tellurium; Compounds thereof
    • C01B19/002Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/64Heavy metals or compounds thereof, e.g. mercury
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00Sulfur; Compounds thereof
    • C01B17/48Sulfur dioxide; Sulfurous acid
    • C01B17/50Preparation of sulfur dioxide
    • C01B17/56Separation; Purification
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B19/00Selenium; Tellurium; Compounds thereof
    • C01B19/007Tellurides or selenides of metals
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/80Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
    • C01P2002/82Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/80Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
    • C01P2002/86Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by NMR- or ESR-data
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/80Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
    • C01P2002/89Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by mass-spectroscopy
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/32Thermal properties
    • C01P2006/33Phase transition temperatures
    • C01P2006/34Melting temperatures
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/60Optical properties, e.g. expressed in CIELAB-values

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention relates to a method for the removal of mercury from gas containing sulphur dioxide and oxygen and from the sulphuric acid vapour contained in the gas. According to the method, the gas is washed with a water solution that contains selenium ions, whereby metallic selenium is formed in the presence of oxygen, which precipitates the mercury in the gas and vapour either as a selenide or in a chlorine-containing environment, as a dichloride of mercury and selenium. Gas washing occurs at a low temperature, below 50 ~C.

Description

METHOD FOR REMOVING MERCURY FROM GAS
The present invention relates to a method for the removal of mercury from gas containing sulphur dioxide and oxygen and from the sulphuric acid s vapour contained in the gas. According to the method, the gas is washed with a water solution that contains selenium ions, whereby metallic selenium is formed in the presence of oxygen, which precipitates the mercury in the gas and vapour either as a selenide or, in a chlorine-containing environment, as a double chloride of mercury and selenium. Gas washing occurs at a low to temperature, below 50°C.
Sulphuric acid is usually produced from sulphur dioxide-containing gases such as those from the roasting and smelting of zinc and copper concentrates. The Hg content of gases generated in roasting is of the order is of 5 - 500 mg/Nm3. The most thorough removal of mercury from the gases is a prerequisite for the production of high quality sulphuric acid. This means that the maximum mercury content of sulphuric acid may be of the order of 0.1 mglkg H2S04.
2o The removal of mercury from gas has been carried out in many ways, which can be divided according to their operating principle into two groups. The first includes methods based on adsorption and filtration, and the second methods based on precipitation and filtration.
2s Adsorption-filtration methods are applicable only to conditions where the mercury content of the gas is low i.e. typically of the order of less than 10 mg/Nm3. In these methods the gas is routed through a filter and the mercury is adsorbed into the contact surfaces. Y-type zeolite impregnated with sulphur, active carbon and selenium filters have been used as adsorbents.
30 The use of a selenium filter is described for example in US patent 3,786,619, where the method is based on the reaction between gaseous mercury and solid selenium. An inert porous filter material is used in this method, onto which a solution containing selenium dioxide, Se02, is absorbed and dried. Selenium dioxide is reduced by the effect of the sulphur dioxide in the gas to be washed into elemental selenium, which further s reacts with the mercury forming selenides HgSe.
Precipitation-filtration methods are used in processes where the mercury charge contained in the gas is large, >_ 800 mg/Nm3. In these methods mercury is precipitated as an insoluble compound and removed from the io washers as a slurry, which is filtered. A filtration method is described for example in US patent 3.677,696, where mercury is sulphated in concentrated wash acid at temperatures of 160 - 220°C and precipitated from the circulating sulphuric acid solution. A method is known from US
patent 4,640,751, where the gases are washed with a chloride solution and is mercury is precipitated as calomel Hg2Cl2.
CA patent 934 131 presents a method whereby gases containing mercury are cleaned using 1 - 67 percent by weight sulphuric acid in temperatures of 50 - 110°C. The washing liquid used is thus a sulphuric acid solution, 2o saturated with active sulphur or selenium, present in solid form in suspension. In the connotation used here, the word active means that the compounds may be present in a very finely divided form, preferably in a freshly generated state. It is beneficial to add sulphur or selenium to the roasting gas before washing or also directly to the wash acid. Selenium may 2s be added in the form of selenium dioxide for example. When this compound comes into contact with the sulphur dioxide in the roasting gas, the sulphur dioxide reduces the selenium dioxide to elemental selenium in the diluted acid in an especially active "in situ" form. Sulphur and selenium have been found to have a surprising effect in combination. This method has made it so possible to reduce the mercury content in sulphuric acid to a value of 0.2 mg Hg/kg H2S04.

A method is known from CA patent 983 671, whereby mercury is removed from a sulphuric acid solution produced from sulphur dioxide gas by adding thiosulphate to the acid and separating the mercury sulphide thus formed, s for instance by flotation or filtration.
This invention relates to a method whereby mercury is removed from gas containing sulphur dioxide and oxygen and from the sulphuric acid vapour contained in the gas, using selenium. The well-known fact that the selenium ~o ion is easily reduced to metal by sulphur dioxide is utilised in this invention.
According to the invention, water, to which a solution containing selenium ions is added, is used as the wash water for oxygen-containing sulphur dioxide gas such as roaster gas. The reactions between the sulphur dioxide and oxygen contained in the gas and the selenium compound in the wash ~s water generate metallic selenium and sulphuric acid. In addition, sulphuric acid vapour is present in the gas. In practice it has been found that the gas coming to the acid plant from the roaster includes the majority of the mercury as dissolved in the acid vapour and only a very small fraction of it (less than 10%) is present as gaseous mercury or mercury compounds. The 2o sulphuric acid dissolves the mercury from the gases into the wash water and the dissolving mercury reacts with the selenium particles in the wash water further to form slightly soluble Se,Hg compounds. The reaction occurs at low temperatures, below 50 °C. The selenium content of the wash water is adjusted in the range 100 - 1000 mg Sell. The essential features of the 2s invention will be made apparent in the attached claims.
The reduction of the selenium compound contained in the wash water using the roaster gas can be described by the following reaction:
Se4+ + 2 S02(g) + 02 (g) + 2 H20 + 4 a =_> Se° + 4 H+ + 2 SO42- (1 ) 3o The sulphuric acid in droplet (vapour) form reacts with the selenium compound in the wash water according to the following reaction:

Se4+ + 2 S032- + 2 H20 =_> Se° + 4 H+ + 2 S042- (2) The washing of the mercury from the gas occurs with the aid of the sulphuric acid thus formed so that the mercury dissolving in the wash water further reacts to make slightly soluble Se, Hg compounds on the surface of the s selenium particles. The washing stage can be presented with a complete reaction e.g. regarding elemental mercury:
Hg + H2S04 =_> Hg2+ + S042~ + 2H+ + 2e (3) The reactions, occurring on the surface of the elemental selenium formed in io the washing, depend on whether the mercury removal is performed in a chlorine-free or chlorine-containing environment. When there is a chlorine free environment, mercury reacts on the surface of the selenium particles forming a slightly soluble mercury selenide. In a chlorine-containing environment the product is a Hg,Se double chloride. The reactions can be is expressed as follows:
Hg2+ + Se + 2e -_> HgSe (4) 3 Hg2+ + 2Se + 2C1- + 4e~ _> 2HgSe*HgCl2 (5) It has been noted in experiments that mercury removal works best when a 2o high selenium content is maintained in the wash solution, such as 100 -1000 mg Se/I. The amount of selenium is adjusted so that the selenium content is saturated in all conditions in relation to the metallic selenium formed from the liquid. The regulation of the selenium content is performed with a continuous feed. In the washing stage sulphuric acid is not added to 2s the wash solution but instead the wash liquid required for washing is pure water and the acid needed in all the reactions is either present as acid vapour in the gas or is generated as a result of the reactions of the sulphur dioxide and selenium ions in the gas. A high level of selenium and the acid produced in reaction (2) are sufficient to produce a suitable environment for 3o the effective removal of mercury. Thus the method works in almost pure water, since the acid produced by the reducing reaction of the selenium s creates the conditions whereby the elemental selenium remains (meta)stable for sufficiently long periods of time from the standpoint of mercury removal. In practice it has been found possible with the present method to produce sulphuric acid on a commercial scale with a mercury s content of less than 0.1 mg/kg H2S04.

Claims (5)

WE CLAIM:
1. A method for the removal of mercury from gas containing sulphur dioxide and oxygen and from the sulphuric acid vapour contained in the gas, wherein the gas is washed using water as the washing liquid and that a liquid selenium compound is fed into the washing liquid so that its selenium content is in the range of 100-1000 mg Se/I
at a temperature below 50° C.
2. A method according to claim 1, wherein the amount of selenium is adjusted so that the selenium content is saturated in all conditions with regard to the metallic selenium formed from the liquid.
3. A method according to claim 1, wherein the regulation of the selenium content takes place using a continuous feed.
4. A method according to claim 1, wherein in a chlorine-free environment the mercury is recovered as mercury selenide HgSe.
5. A method according to claim 1, wherein in a chlorine-containing environment the mercury is recovered as a double chloride 2HgSe*HgCl2.
CA002429837A 2000-12-08 2001-12-07 Method for removing mercury from gas Expired - Lifetime CA2429837C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20002698A FI117617B (en) 2000-12-08 2000-12-08 A method for removing mercury from a gas
FI20002698 2000-12-08
PCT/FI2001/001064 WO2002045825A1 (en) 2000-12-08 2001-12-07 Method for removing mercury from gas

Publications (2)

Publication Number Publication Date
CA2429837A1 CA2429837A1 (en) 2002-06-13
CA2429837C true CA2429837C (en) 2009-09-01

Family

ID=8559677

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002429837A Expired - Lifetime CA2429837C (en) 2000-12-08 2001-12-07 Method for removing mercury from gas

Country Status (17)

Country Link
US (1) US7481865B2 (en)
EP (1) EP1347818B1 (en)
JP (1) JP2004515431A (en)
KR (1) KR100840170B1 (en)
CN (1) CN100366326C (en)
AT (1) ATE531443T1 (en)
AU (2) AU1717002A (en)
BR (1) BR0116029A (en)
CA (1) CA2429837C (en)
EA (1) EA004577B1 (en)
ES (1) ES2376993T3 (en)
FI (1) FI117617B (en)
MX (1) MXPA03005116A (en)
NO (1) NO336277B1 (en)
PE (1) PE20030633A1 (en)
WO (1) WO2002045825A1 (en)
ZA (1) ZA200304051B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100836207B1 (en) * 2001-01-18 2008-06-09 웰리켐 바이오 테크 인크. Novel 1,2-diphenylethene derivatives for treatment of immune diseases
JP5040324B2 (en) * 2007-01-17 2012-10-03 住友金属鉱山株式会社 Method for cooling and cleaning copper smelting exhaust gas
JP2008190950A (en) * 2007-02-02 2008-08-21 Horiba Ltd Removing method and removing device for selenium oxide in sample, and measuring method and measuring device for mercury in coal combustion exhaust gas using them
US8491865B2 (en) * 2008-02-28 2013-07-23 Brown University Nanostructured sorbent materials for capturing environmental mercury vapor
EP2250014B1 (en) * 2008-02-28 2019-12-04 Brown University Nanostructured sorbent materials for capturing environmental mercury vapor
US20110049045A1 (en) * 2008-10-07 2011-03-03 Brown University Nanostructured sorbent materials for capturing environmental mercury vapor
CN104032137B (en) * 2014-06-05 2016-06-22 东北大学 A kind of method reclaiming hydrargyrum with selenides form from mercurous tailings
CN105056733B (en) * 2015-07-30 2017-06-06 中南大学 Mercury release inhibitor and its application again in a kind of flue gas during smelting washing process
CA3035525A1 (en) 2016-09-02 2018-03-08 Regents Of The University Of Minnesota Systems and methods for body-proximate recoverable capture of mercury vapor during cremation
CN107051405B (en) * 2017-04-10 2019-05-31 浙江工业大学 A kind of sponge loading nanometer selenium and its chemical preparation and application
CN106902776B (en) * 2017-04-10 2019-01-08 浙江工业大学 Mercury-removing wallpaper for workshop of high-mercury industry and preparation method thereof
CN106975289B (en) * 2017-04-10 2019-05-28 浙江工业大学 A kind of high mercury workshop air clarifier core strainer and the preparation method and application thereof
CN115715973A (en) * 2019-05-31 2023-02-28 贵州重力科技环保有限公司 In-situ nano-selenium carbon-based demercuration adsorption material and preparation method and application thereof
CN113521979B (en) * 2021-08-12 2024-01-12 上海交通大学 Method for trapping mercury from sulfur-containing mercury-containing flue gas through chlorselenomel deposition

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE334598B (en) 1969-09-01 1971-05-03 Boliden Ab
FI45767C (en) * 1970-07-03 1972-09-11 Outokumpu Oy Method for removing and recovering mercury and / or selenium from mercury and / or selenium-containing gases.
US3786619A (en) 1971-06-04 1974-01-22 Boliden Ab Method of purifying gases containing mercury compounds and elementary mercury
US4057423A (en) * 1971-09-10 1977-11-08 Mitsui Mining & Smelting Co., Ltd. Method for the manufacture of mercury free sulfuric acid
BE788615A (en) 1971-09-10 1973-01-02 Mitsui Mining & Smelting Co MERCURY-FREE SULFURIC ACID PRODUCTION PROCESS
CA983671A (en) 1973-05-17 1976-02-17 Bo G.V. Hedenas Method of removing mercury from sulfuric acid
SE403277B (en) * 1976-04-09 1978-08-07 Boliden Ab PROCEDURES FOR WATER PURIFICATION OF GASES CONTAINING SULFUR DIOXIDE, HALOGENES AND AT LEAST ONE VOLATILE SUBJECT FROM THE GROUP INCLUDING ARSENIC AND ARSENIC ASSOCIATIONS
SU889071A1 (en) * 1980-02-01 1981-12-15 Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Горно-Металлургический Институт Цветных Металлов Method of purifying calcining gases from mercury vapurs
FI62002C (en) * 1981-04-15 1982-11-10 Outokumpu Oy REFERENCE FITTING FOR SEPARATION OF A QUANTIFIED HYDROGEN WITH HYDROGEN GASER
SE432361B (en) * 1981-05-08 1984-04-02 Boliden Ab PROCEDURE FOR SEPARATION OF GASFUL ELEMENTAL MERCURY SILVER FROM A GAS
JPS58114728A (en) * 1981-12-28 1983-07-08 Mitsubishi Metal Corp Mercury removing agent and its production
NO157543C (en) 1984-10-19 1988-04-06 Norzink As PROCEDURE FOR PURIFICATION OF MERCURY OIL GASES AND RECOVERY OF THE MERCURY OIL IN METALLIC FORM.
DE4123258A1 (en) * 1991-07-13 1993-01-14 Steinmueller Gmbh L & C METHOD FOR CLEANING A SULFUR DIOXIDE AND Possibly. OTHER EXHAUST GASES CONTAINING POLLUTANTS
US5480619A (en) 1994-06-28 1996-01-02 The Babcock & Wilcox Company Regenerative scrubber application with condensing heat exchanger
AU3763797A (en) * 1996-08-14 1998-03-06 Noranda Inc. Process for the removal of mercury from smelter gases
US6375909B1 (en) * 2000-09-14 2002-04-23 Infilco Degremont Inc. Method for the removal of mercury and nitrogen oxides from combustion flue gas

Also Published As

Publication number Publication date
NO20032507L (en) 2003-06-03
WO2002045825A1 (en) 2002-06-13
EA004577B1 (en) 2004-06-24
EP1347818B1 (en) 2011-11-02
NO336277B1 (en) 2015-07-06
US7481865B2 (en) 2009-01-27
PE20030633A1 (en) 2003-08-19
CA2429837A1 (en) 2002-06-13
AU1717002A (en) 2002-06-18
EA200300649A1 (en) 2003-12-25
EP1347818A1 (en) 2003-10-01
ZA200304051B (en) 2004-02-27
ATE531443T1 (en) 2011-11-15
FI20002698A0 (en) 2000-12-08
ES2376993T3 (en) 2012-03-21
US20040081605A1 (en) 2004-04-29
BR0116029A (en) 2003-10-07
KR20040010575A (en) 2004-01-31
JP2004515431A (en) 2004-05-27
MXPA03005116A (en) 2003-09-05
CN1479647A (en) 2004-03-03
KR100840170B1 (en) 2008-06-23
AU2002217170B2 (en) 2006-07-20
NO20032507D0 (en) 2003-06-03
CN100366326C (en) 2008-02-06
FI117617B (en) 2006-12-29
FI20002698A (en) 2002-06-09

Similar Documents

Publication Publication Date Title
CA1080938A (en) Method of extracting and recovering mercury from gases
CA2429837C (en) Method for removing mercury from gas
FI57445C (en) RENING AV GASER INNEHAOLLANDE KVICKSILVERAONGA
US4394354A (en) Silver removal with halogen impregnated activated carbon
AU2002217170A1 (en) Method for removing mercury from gas
AU687277B2 (en) Method for separating substances from a gaseous medium by dry adsorption
NO138323B (en) PROCEDURE FOR AA REMOVING MERCURY FROM A SULFUR DIOXIDE-CONTAINING GAS
KR20030043618A (en) A method for eliminating traces of mercury in gases
CA1106613A (en) Process for removing mercury from brine sludges
FR2692879A1 (en) Process for purifying an aqueous solution of alkali metal chloride to remove iodine
FI58621C (en) FOERFARANDE FOER RENING AV SVAVELSYRA INNEHAOLLANDE KVICKSILVER
US4396585A (en) Silver removal with halogen impregnated non-carbon adsorbents
JP4464592B2 (en) Purification method of aqueous buffer solution
CN108031052B (en) Barite thermal reduction-water-leaching barium slag detoxification process
JPH11514962A (en) Composition containing sodium bicarbonate, its preparation and its use
FI117190B (en) A method for removing mercury from sulfuric acid by thiosulfate precipitation
JP2007237169A (en) Adsorbent for treating liquid phase and its manufacturing method
JPS602896B2 (en) Method for removing mercury from smelting exhaust gas
JPS58114728A (en) Mercury removing agent and its production
JP2009050784A (en) Treatment method of arsenic-containing solution
JPH1135305A (en) Production of purified aqueous hydrogen peroxide solution
WO1989010181A1 (en) Method for removing sulphur and nitrogen compounds from gas
JPS594378B2 (en) Manufacturing method of high purity sodium sulfate
EP0127664A1 (en) A method for producing pure sulphuric acid and a high-grade mercury product from gases that contain sulphur dioxide and mercury

Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20211207